The tiniest bird in mainland North America: the Calliope Hummingbird - a 3-1/4-inch jewel, weighing in at just a tenth of an ounce. These birds migrate north each spring from Western Mexico. From its perch, a male Calliope Hummingbird surveys its territory. This exquisite bird was named…

In a Western ponderosa pine savanna, tall pines dot an open, grassy landscape. A Western Bluebird flits from a gnarly branch, as this Cassin's Finch belts out a rapid song. The trees here grow singly or in small stands. Upslope, the pines become denser, mixing with firs. Downhill, the…

In spring, a male Sooty Grouse calls from a concealed perch high in a tall conifer. Known as “hooting,” it’s a very low-pitched, five or six-note thunking sound. When a female cackles in response, the male flies down and displays to her by strutting and fanning his tail. Females are…

Among the most welcome features of spring is the renewal of bird song. Can you imagine a spring without the voices of birds? The silence would -- as they say -- be deafening, the absence of their songs like the loss of one of our primary senses. Rachel Carson's 1962 book, Silent Spring…

Arroyo means "stream" in Spanish. With mesquite, yucca, and cactus along their edges, arroyos in the Southwest fill with water only a few times a year, mostly during the heavy rains of late summer. There's a remarkable diversity of wildlife here, including this Pyrrhuloxia. Birds here are…

A modest thicket of trees along a street can be the perfect place to hear one of the earliest bird songs of spring: the Fox Sparrow. You can hear their loud, spirited songs from dense vegetation throughout much of the U.S. The easternmost birds have the rufous color of a Red Fox. Others…

The vernal equinox, the first day of spring. The moment when the sun is directly above the equator, and day and night are nearly equal all over the world. Yet birds sense the growing hours of daylight through a surge of hormones. It’s time to sing! Both science and folklore tie spring to…

House Finches eat many kinds of seeds and fruits. A careful look at male House Finches at a feeder shows that, while most males show red feathering, some are decidedly more orange - and some even yellow. House Finches acquire their coloration from pigments known as carotenoids in the foods…

Scientists have puzzled for centuries over how different groups of birds are related. Did birds that look physically alike, such as falcons and hawks, arise from a common ancestor, or did they reach those similarities independently? This line of inquiry was given an immense boost in recent…

Thanks in part to the political will and financial contributions of waterfowl hunters and such organizations as Ducks Unlimited, natural wetlands that might otherwise have been lost have been preserved. Take a field trip with your local Audubon chapter to see what you can see. Maybe you'll…